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Mac OS X - Problems with MIDI devices after an update

I use a Mac, and after installing an OS update, one or more of my MIDI devices aren't communicating with the computer or are acting strangely. What should I do?

When installing a major Mac OS update over an existing one (not using a clean install), or when using Apple's Migration Assistant to transfer files and preferences from one Mac to another, you will often run into trouble with drivers not working properly, authorizations being lost or corrupted etc. When files are mixed between systems, or are transferred to a system they weren't specifically intended or created for, difficulty is always a possibility.

The suggesions below may help resolve these symptoms.

If your MIDI devices don't work properly after an update or migration.

Empty the contents of the following two folders by moving their files into to two new folders on your desktop: